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ip: restore IP forwarding on device deconfiguration

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With the ipv4.forwarding property we may modify the forwarding sysctl of
the device on activation. In next commits, we will also modify it if the
connection is shared, instead of modifying the global forwarding.

Restore the forwarding value to the default one when the device is
deconfigured for any reason.

Fixes: a8a2e6d727 ('ip-config: Support configuring per-device IPv4 sysctl forwarding option')
This commit is contained in:
Íñigo Huguet 2025-05-02 08:37:16 +02:00 • committed by Íñigo Huguet
parent f2a2e49d07
commit d58d0a793e
1 changed files with 28 additions and 0 deletions
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28
src/core/devices/nm-device.c
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@ -13845,6 +13845,32 @@ _dev_ipshared6_start(NMDevice *self)
/*****************************************************************************/
static void
_dev_ipforwarding_cleanup(NMDevice *self, int addr_family, CleanupType cleanup_type)
{
gs_free const char *default_forwarding = NULL;
gs_free const char *current_forwarding = NULL;
if (!NM_IS_IPv4(addr_family))
return;
if (!NM_IN_SET(cleanup_type, CLEANUP_TYPE_DECONFIGURE, CLEANUP_TYPE_KEEP_REAPPLY))
return;
default_forwarding = nm_platform_sysctl_get(
nm_device_get_platform(self),
NMP_SYSCTL_PATHID_ABSOLUTE("/proc/sys/net/ipv4/conf/default/forwarding"));
if (!default_forwarding)
return; /* Non fatal */
current_forwarding = nm_device_sysctl_ip_conf_get(self, AF_INET, "forwarding");
if (!nm_streq0(current_forwarding, default_forwarding))
nm_device_sysctl_ip_conf_set(self, AF_INET, "forwarding", default_forwarding);
}
/*****************************************************************************/
static void
act_request_set(NMDevice *self, NMActRequest *act_request)
{
@ -13957,6 +13983,8 @@ _cleanup_ip_pre(NMDevice *self, int addr_family, CleanupType cleanup_type, gbool
NMDevicePrivate *priv = NM_DEVICE_GET_PRIVATE(self);
gboolean keep_reapply = (cleanup_type == CLEANUP_TYPE_KEEP_REAPPLY);
_dev_ipforwarding_cleanup(self, addr_family, cleanup_type);
_dev_ipsharedx_cleanup(self, addr_family);
_dev_ipdev_cleanup(self, AF_UNSPEC);